超导磁共振机房的磁干扰及屏蔽分析

Analysis on magnetic interference and shielding of machine room of superconductive MR

目的:分析探讨磁共振成像(MRI)系统安装环境的磁干扰及屏蔽措施,以满足MRI系统的正常工作。方法:评估MRI系统安装前外部环境和动态干扰环境,分析磁体等中心磁场的磁力线而构成的影响。结果:在MRI系统机房选址时首先考虑磁干扰及其影响因素,并予以屏蔽措施,根据实际的场地环境施以磁屏蔽及射频屏蔽措施,使超导MRI机房具备磁共振系统运行的基础条件。结论:对MRI系统安装环境磁干扰及屏蔽的评估,是顺利完成MRI系统安装工作的关键环节。

Objective： To analyze and explore the measurement of magnetic interference and shielding of the installation environment of magnetic resonance（MR） system so as to satisfy the normal operation of MR system. Methods： The external environment and dynamic interference environment before the MR system was installed were evaluated, and the influences of magnetic line of force of central magnetic field（such as magnet） were further analyzed. Results： When the site of machine room of MR system was selected, the magnetic interference and its influence should be considered at the first step, and the shielding measurement should be provided. And the implemented magnetic shielding and measurement of radio shielding should depend on the actual environment so as to take the superconductive MR machine room with the basic condition of operation of MR system. Conclusion： An assessment of magnetic interference and shielding of installation environment of MR system is the key link that ensures installation work of MR system can be smoothly completed.